# Giant ferroelectric polarization in a bilayer graphene heterostructure https://mdr.nims.go.jp/datasets/463d46d3-88cd-404c-9026-9cb5ea0e80b0 ## File - [s41467-022-34104-z.pdf](https://mdr.nims.go.jp/filesets/f8109ccf-67b7-4917-b92e-c06d8601d2c8/download) ([Detail](https://mdr.nims.go.jp/filesets/f8109ccf-67b7-4917-b92e-c06d8601d2c8.md)) ## Id 463d46d3-88cd-404c-9026-9cb5ea0e80b0 ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-02-26T07:49:54.541553Z ## Updated at 2025-02-27T07:30:30.098260Z ## Published at 2025-02-27T07:30:30.181505Z ## Doi ## First published url https://doi.org/10.1038/s41467-022-34104-z ## Date published 2022-10-21 ## Recorded date published ## Resource type journal_article ## Manuscript type vor ## Collection ## Title - title: Giant ferroelectric polarization in a bilayer graphene heterostructure title_type: original lang: en ## Description - description: At the interface of van der Waals heterostructures, the crystal symmetry and the electronic structure can be reconstructed, giving rise to physical properties superior to or absent in parent materials. Here by studying a Bernal bilayer graphene moiré superlattice encapsulated by 30°-twisted boron nitride flakes, we report an unprecedented ferroelectric polarization with the areal charge density up to 1013 cm-2, which is far beyond the capacity of a moiré band. The translated polarization ~5 pC m-1 is among the highest interfacial ferroelectrics engineered by artificially stacking van der Waals crystals. The gate-specific ferroelectricity and co-occurring anomalous screening are further visualized via Landau levels, and remain robust for Fermi surfaces outside moiré bands, confirming their independence on correlated electrons. We also find that the gate-specific resistance hysteresis loops could be turned off by the other gate, providing an additional control knob. Furthermore, the ferroelectric switching can be applied to intrinsic properties such as topological valley current. Overall, the gate-specific ferroelectricity with strongly enhanced charge polarization may encourage more explorations to optimize and enrich this novel class of ferroelectricity, and promote device applications for ferroelectric switching of various quantum phenomena. description_type: abstract lang: und ## Creator - name: Ruirui Niu role: author - name: Zhuoxian Li role: author - name: Xiangyan Han role: author - name: Zhuangzhuang Qu role: author - name: Dongdong Ding role: author - name: Zhiyu Wang role: author - name: Qianling Liu role: author - name: Tianyao Liu role: author - name: Chunrui Han role: author - name: Kenji Watanabe role: author orcid: https://orcid.org/0000-0003-3701-8119 organization: National Institute for Materials Science - name: Takashi Taniguchi role: author orcid: https://orcid.org/0000-0002-1467-3105 organization: National Institute for Materials Science - name: Menghao Wu role: author - name: Qi Ren role: author - name: Xueyun Wang role: author - name: Jiawang Hong role: author - name: Jinhai Mao role: author - name: Zheng Han role: author - name: Kaihui Liu role: author - name: Zizhao Gan role: author - name: Jianming Lu role: author ## Contact agent ## Publisher organization: Springer Science and Business Media LLC ## Managing organization ## Keyword - subject: Ferroelectric polarization schema: not_defined - subject: bilayer graphene schema: not_defined - subject: Landau levels schema: not_defined ## Rights - identifier: https://creativecommons.org/licenses/by/4.0/ ## Other identifier(s) ## Data origin ## Embargo ## Journal - title: Nature Communications issn: '20411723' volume: '13' issue: '1' article_number: '6241' ## Conference ## Related item ## Funding - identifier: Z190011 funder_name: Natural Science Foundation of Beijing Municipality - funder_name: National Key R&D Program of China ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: f8109ccf-67b7-4917-b92e-c06d8601d2c8 filename: s41467-022-34104-z.pdf content_type: application/pdf size: 2918249 md5: 78701e1b7c53a3eaf2304a3e1a122e1a ## Thumbnail fileset_id: f8109ccf-67b7-4917-b92e-c06d8601d2c8 filename: s41467-022-34104-z.pdf